Orchard heaters and wind machines are most useful in preventing damaging low temperatures from occurring next to the ground on ____.
A) clear, windy nights
B) cloudy, windy nights
C) rainy nights
D) clear, calm nights

Question

Quizplus · Accepted Answer

Orchard heaters and wind machines work by mixing the colder air near the ground with warm air above, so they are most effective in still air. Therefore, they are most useful in preventing damaging low temperatures from occurring next to the ground on clear, calm nights.

Orchard Heaters and Wind Machines Are Most Useful in Preventing